Commutativity up to a factor of bounded operators in complex Hilbert space

Details Commutativity up to a factor of bounded operators in complex Hilbert space Commutativity up to a factor of bounded operators in complex Hilbert space

2000-07-09

arxiv.org/abs/math/0007049v3

Proc. Roy. Soc. A (London) 458 (2002) 109-118.

Mathematics

Functional Analysis

9 pages. Material reorganised, new examples added to highlight relations between main results. Submitted to Proc. Roy. Soc. A

Scientific paper

10.1098/rspa.2001.0858

We explore commutativity up to a factor, $AB=\lambda BA$, for bounded operators in a complex Hilbert space. Conditions on the possible values of the factor $\lambda$ are formulated and shown to depend on spectral properties of the operators involved. Commutativity up to a unitary factor is considered for pairs of self-adjoint operators. Examples of nontrivial realizations of such commutation relations are given.

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